arch(cli): init readme

Author: gusye1234

src/client/acontext-cli/readme.md

@@ -0,0 +1,7 @@
+# `acontext-cli`
+`acontext-cli` is a command line tool for Acontext's quickstart. You can use it to create templete projects and manage your api keys.
+
+## Usage
+```
+...
+```